<!--
 作者：ex_baiyc
 日期：2016-11-2
 功能：可锁定头及列的表格组件
 参数：需要传进来的参数：'tableTitle', 'thead', 'gridColumns', 'tableRows', 'tableHeight'
 事件：点击表头对当前列进行排序
-->
<template>
  <div>
    <div id="divBox1" :style="{height:height}">
      <table id="tbTest1" cellpadding="0" cellspacing="0" style="text-align:center;width:24rem;background:#F4F9FF;">
        <tr>
          <th v-for="item in thead" @click="sortBy(item)">
            {{item}}
          </th>
        </tr>
        <tr v-for="row in tableRows  | orderBy sortBykey sortOrders[sortKey]">
          <td style="overflow:hidden;white-space:nowrap;" v-for="item in gridColumns" v-html="" :id="$parent.$index">
            <div style="width:100%;height:100%;position:relative;">
              <div style="position:absolute;">{{row[item] | numberFilter}}</div>
              <div style="position:absolute;width:100%;height:50%;background:red;"></div>
            </div>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>

<script>
  /*eslint-disable*/
  var ofixed_table_st = window.setTimeout;
  var hasLeft = '';
  var hasHead = '';
  window.setTimeout = function(fRef, mDelay) {
    if(typeof fRef == 'function') {
      var argu = Array.prototype.slice.call(arguments, 2);
      var f = (function() {
        fRef.apply(null, argu);
      });
      return ofixed_table_st(f, mDelay);
    }
    return ofixed_table_st(fRef, mDelay);
  };

  function oFixedTable(id, obj, _cfg) {
    this.id = id;
    this.obj = obj;
    this.box = this.obj.parentNode;
    this.config = {
      fixHead: _cfg.fixHead || true,
      rows: _cfg.rows || 1,
      cols: _cfg.cols || 0,
      background: _cfg.background || '#ffffff',
      zindex: _cfg.zindex || 10
    };

    window.setTimeout(this._fixTable, 500, this);
  }

  oFixedTable.prototype._fixTable = function(_) {
    if(_.obj.rows.length <= 0) {
      return false;
    }
    var hasLeft = _.buildLeft();
    var hasHead = _.buildHead();

    _.box.onscroll = function() {
      if(_.divHead != null) {
        _.divHead.scrollLeft = this.scrollLeft;
      }
      if(_.divLeft != null) {
        _.divLeft.scrollTop = this.scrollTop;
      }
    };
    if(hasHead && hasLeft) {
      _.buildTopLeft();
    }
  };

  oFixedTable.prototype.buildHead = function() {
    var _ = this;
    var strDivId = _.id + '_div_head';
    var strTbId = _.id + '_tb_header';
    var div = document.createElement('div');
    div.id = strDivId;
    div.style.cssText = 'position:absolute;overflow:hidden;z-index:' + (_.config.zindex + 1) + ';';
    div.innerHTML = '<table id="' + strTbId + '" cellpadding="0" cellspacing="0" style="background:' + _.config.background + ';"></table>';

    _.box.insertBefore(div, _.obj);

    _.divHead = div;
    _.tbHead = document.getElementById(strTbId);

    //判断是否出现纵向滚动条，若出现，高度减去滚动条宽度 16px
    var sw = _.obj.offsetHeight > _.box.offsetHeight ? 0 : 0;
    _.divHead.style.width = (_.box.offsetWidth - sw) + 'px';

    _.tbHead.style.textAlign = _.obj.style.textAlign;
    _.tbHead.style.width = _.obj.offsetWidth + 'px';

    var hasHead = false;
    if(_.config.fixHead && _.obj.tHead != null) {
      var tHead = _.obj.tHead;
      _.tbHead.appendChild(tHead.cloneNode(true));
      hasHead = true;
    } else {
      for(var i = 0; i < _.config.rows; i++) {
        var row = _.obj.rows[i];
        if(row != null) {
          _.tbHead.appendChild(row.cloneNode(true));
          hasHead = true;
        }
      }
    }
    return hasHead;
  };

  oFixedTable.prototype.buildLeft = function() {
    var _ = this;
    if(_.config.cols <= 0) {
      return false;
    }
    var strDivId = _.id + '_div_left';
    var strTbId = _.id + '_tb_left';
    var div = document.createElement('div');
    div.id = strDivId;
    div.style.cssText = 'position:absolute;overflow:hidden;z-index:' + _.config.zindex + ';';
    div.innerHTML = '<table id="' + strTbId + '" cellpadding="0" cellspacing="0" style="background:' + _.config.background + ';"></table>';

    _.box.insertBefore(div, _.obj);

    _.divLeft = div;
    _.tbLeft = document.getElementById(strTbId);

    _.tbLeft.style.textAlign = _.obj.style.textAlign;

    //判断是否出现横向滚动条，若出现，高度减去滚动条高度 16px
    var sw = _.obj.offsetWidth > _.box.offsetWidth ? 0 : 0;
    _.divLeft.style.height = (_.box.offsetHeight - sw) + 'px';

    var hasLeft = false;
    for(var i = 0, rows = _.obj.rows.length; i < rows; i++) {
      var row = _.tbLeft.insertRow(_.tbLeft.rows.length);
      row.style.cssText = _.obj.rows[i].style.cssText;

      for(var j = 0; j < _.config.cols; j++) {
        var cell = _.obj.rows[i].cells[j];
        if(cell != null) {
          row.appendChild(cell.cloneNode(true));
          cell.style.cssText = _.obj.rows[i].cells[j].style.cssText;
          hasLeft = true;
        }
      }
    }
    return hasLeft;
  };

  oFixedTable.prototype.buildTopLeft = function() {
    var _ = this;
    var strDivId = _.id + '_div_top_left';
    var strTbId = _.id + '_tb_top_left';
    var div = document.createElement('div');
    div.id = strDivId;
    div.style.cssText = 'position:absolute;overflow:hidden;z-index:' + (_.config.zindex + 2) + ';';
    div.innerHTML = '<table id="' + strTbId + '" cellpadding="0" cellspacing="0" style="background:' + _.config.background + ';"></table>';

    _.box.insertBefore(div, _.obj);

    var tbTopLeft = document.getElementById(strTbId);
    tbTopLeft.style.textAlign = _.obj.style.textAlign;

    for(var i = 0; i < _.config.rows; i++) {
      var row = tbTopLeft.insertRow(tbTopLeft.rows.length);
      row.style.cssText = _.obj.rows[i].style.cssText;

      for(var j = 0; j < _.config.cols; j++) {
        var cell = _.obj.rows[i].cells[j];
        if(cell != null) {
          row.appendChild(cell.cloneNode(true));
          cell.style.cssText = _.obj.rows[i].cells[j].style.cssText;
          hasLeft = true;
        }
      }
    }
  };


  export default{
    // 接收父组件传过来的参数
    props: ['tableRows', 'gridColumns', 'thead', 'store', 'height'],
    // 监控
    watch: {
      'tableRows': function (val) {
        // 明星店铺页面时动态调整店铺名所在列的宽度
        if (this.store) {
          document.querySelectorAll('table td:nth-child(3)')[0].style.width = 3 + 'rem'
          document.querySelectorAll('table th:nth-child(3)')[0].style.width = 3 + 'rem'
        }
        var self = this
        var length = self.gridColumns.length
        document.getElementById('tbTest1').style.width = 2 * length + 'rem'
        setTimeout(function () {
          var tbObj = document.getElementById('ofix1_tb_header')
          tbObj.addEventListener('click',function (event) {
            if(event.target.tagName === 'TH'){
              self.sortBy(event.target.innerText)
            }
          })
        }, 501)
      }
    },
    data: function() {
      var sortOrders = {}
      this.gridColumns.forEach(function (key) {
        sortOrders[key] = 1
      })
      return {
        sortKey: '',
        sortOrders: sortOrders
      }
    },
    methods: {
      sortBykey: function (a, b) {
        return parseFloat(a[this.sortKey]) - parseFloat(b[this.sortKey])
      },
      sortBy: function (key) {
        var activeTheadIndex = 0
        for (var i = 0; i < this.thead.length; i++) {
          if (this.thead[i] === key) {
            activeTheadIndex = i
          }
        }
        this.sortKey = this.gridColumns[activeTheadIndex]
        this.sortOrders[this.gridColumns[activeTheadIndex]] = this.sortOrders[this.gridColumns[activeTheadIndex]] * -1
      }
    },
    filters: {
      numberFilter: function (value) {
        if (value == 0) {
          return '0'
        } else if (!value) {
          return '/'
        } else {
          return value
        }
      }
    },
    components: {
    },
    ready: function() {
      var ofix1 = new oFixedTable('ofix1', document.getElementById('tbTest1'), {
        rows: 1,
        cols: 1
      })
    }
  }
</script>
<style>
  body {
    font-size: 12px;
  }

  #divBox1{
    overflow:auto;
    width:100%;
  }
  #ofix1_div_left{
    box-shadow: #dddddd 0px 2px 5px;
  }
  table {
    table-layout : fixed;
    /*border: solid 1px #ccc;*/
    /*border-collapse: collapse;*/
  }

  table td,
  table th {
    /*border: solid 1px #ccc;*/
    width: 2rem;
    line-height: 1rem;
    height: 1rem;
    padding: 0;
    color: #999999;
    overflow: hidden;
    white-space:nowrap;
    /*word-break:keep-all;*/
  }

  table th{
    background: #BCDBFF;,
    color: #999;
    font-size: .28rem;
    font-weight: normal;
  }
  #ofix1_tb_left{
    width:2rem;
  }
  #tbheader td {
    background: #fff;
  }
</style>
